Adjusting dishijtg-saws



UNITED STATES PATEN FFQE.

EPHRAIM B. WELLS, OF UNIONTOVN, PENNSYLVANIA.

ADJUSTING DISHING-SAWS.

Specification of Letters Patent No. 9,846, dated July 12, 1853-.

To @ZZ whom t may concern:

Be it known that I, EPHRAIM B. VVnLLs, of Uniontown, in the county of Fayette and State of Pennsylvania, have invented a new and useful Improvement on Circular Saws for Curvilinear Cutting; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l, is a view of the top or bed of the bench and the alterable guide, together with the toothed edge of the saw in position for cutting, Fig. 2 is a perspective View of the interior of the bench containing the saw with its spindle, washers and rings in position, n being the spindle, 0 0 the driving pulley, ZL the concave washer, 7a the concave ring, m, m the screws which operate upon the concave-ring, e e the saw, Za, Za the convex ring, ZL the convex washer, Z, Z the screws operating upon the co-nvex ring, and z' the nut working on the screw end of the spindle. Fig. 3 is a view of the saw, with its angular incision f, and Fig. 4 is a longitudinal section of the spindle, the washers, rings, saw and screws being all adjusted upon it.

The construction of my saw is as follows: I take a common circular saw as e e, Fig. 3, in which I make an angular incision j' extending from the eye to the edge of the saw. I then take the spindle n n, Fig. 4, having a fast collar o. Up to this fast collar I then bring a single concave circular washer, with its concave surface facing outward 7L L, Fig. 4, the concave circumference of which is a detached ring 7s, Fig. 2, forming about one half the edge or periphery ofthe washer and extending inward on the concave surface of the washer about one fifth of its radius. I pierce the washer near its periphery for screws m m m, Fig. 4, which act on the ring 7c la perpendicularly to the plane of the washer ZL ZL and thrust itforward from it-s first position, as in Fig. 2. I then place the saw upon the spindle. I next place upon the spindle and up to the saw a convex washer 7c 7c, of which the convexity corresponds to the concavity of the concave washer. Its convex circumference, or outer edge, is also a detached ring, forming about half the periphery of the convex washer and extending inward a distance of about onefifth of its radius. This ring 7c, 7c, is also operated upon by screws Z Z placed near the outer edge of its washer, in the same way as the ring previously described. The outer end of the spindle I cut into a screw fitted with the nut z' z', which as it moves forward upon the spindle drives before it the convex washer ZL Zi', and forces the central portion of the saw into the concavity of the concave washer h L, which concavity, as well as the convexity of the washer Zz` ZL, may be, in effect, increased or diminished to any required amount by protruding or retracting vthe rings Z0 is and 7s Zo from or to their respect-ive washers -Zz L and ZL 7i, thus giving to the saw any required curvature. A further use of the rings is more firmly to hold and keep the saw in position. o o Fig. 2 is lthe driving pulley of the spindle. I then Ahang the saw in its bench t t t t, F ig. l, so

that a portion of its toothed edge e e may stand above the top or bed of the bench. This bench may be of any convenient form. The top of it, however, I fasten at one side ronly by means of hinges or their equivalent,

tended transverse holes in the guide, into the bed of the bench, thus allowing the yguide to be approached to or withdrawn from the saw. The guiding surface o ZJ is not solid, however, but consists of a strong metallic strap, supported by the screws c@ ce cc, attached to the inner side of the st-rap and passing through the solid part of the guide, which screws being protruded or retracted give a less or greater curvature to the metallic strap forming the face of the guide. The curvature of the guide may thus be made to correspond with the curvature of the saw.

It is obvious that the washers and rings may be placed upon the spindle in a different order from that adopted in the forescribed, for the purpose of holding and reggong construction and yet produce the saine ulating the saw to any required curvature. effect.

hat claim as my invention, and desire E' B WELLS 5 to secure by Letters Patent, is Witnesses:

The adjustable rings, in combination With W. BEESON,

the concave and convex Washers as den DANIEL SMITH. 

